Common Plant Diseases

Diseases such as canker, honey fungus, coral spot, and bacterial canker are all extremely serious and can infect plants and fruits alike. In most instances of disease, plants should be removed.
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©2008, Dorling Kindersley Limited

©2008, Dorling Kindersley Limited

©2008, Dorling Kindersley Limited

©2008, Dorling Kindersley Limited

©2008, Dorling Kindersley Limited

Rose Rust

Rose rust spots (here, in spring) shed fungal spores in the summer, and this is followed by leaf loss. Rusts are a large group of diseases, characterized by orangey spots or bumps.

Coral Spot

Coral spot causes pink/red spots that dot the bark of dead wood, but it can invade healthy shoots of many trees and shrubs. It must be cut out.

Hollyhock Rust

Hollyhock rust and other types of rust disease disfigure rather than kill plants. Choose resistant varieties, and keep plants in good health to help resist attacks.

Rose Black Spot

Rose black spot is a fungal disease that is prevalent in wet weather, spreading by water splash in wet, windy conditions. Regular treatment with a fungicide is required, but removing infected leaves and pruning out diseased wood also helps. Catalogs list roses that are more resistant to this disease than others are; while these are worth considering, no rose is completely immune.

Diseased Fruit

Diseased fruits and berries can persist on trees or the ground over winter, ready to release spores in spring. To prevent this, put them out for collection with yard waste, burn them, or bury them in a deep hole.